Why is Recuva [vers.1.53] taking much longer on second recovery operation?

Recuva Recuva Bug Reporting
1

I have accidentally formatted an 8GB hard drive [ouch]. As I do not have another large Drive to tranfer the 4GB data to I just tranferred half of it. The first original recovery took 17 hours to scan the 4 GB data. I am now scanning to recover the remainder and so rescanning the formatted disc again. This second scan is estimating 3 DAYS [and by the progress is probably correct]. Why is this taking so long the second time?

I am on Windows 10 64 bit with 3.40 gigahertz Intel Core i7-2600K

128 kilobyte primary memory cache

1024 kilobyte secondary memory cache

8192 kilobyte tertiary memory cache

64-bit ready

Multi-core (4 total)

Hyper-threaded (8 total)

Thanks in anticipation.

2

Do you really mean 8gb, or 8tb?

If you only had space to recover half of your data then where are you going to put the other half?

How did you select half the data? Did you use any secection criteria in the Recuva scan, or somehow highlight or check half the data found?

If you ran a full scan in the first place then you didn't have to run another. Why did you not just select the other half of the data without rescanning?